Enantioselective Decarboxylative Reactions in Organic Synthesis

Enantioselective decarboxylative reactions harness the release of carbon dioxide from carboxylic acids to generate reactive intermediates—most commonly enolates or their mimics—under relatively mild conditions. The enantiocontrol in these processes is achieved through the action of chiral catalysts, either by organocatalysis or by transition metals bearing stereoinducing ligands. Pioneering work has demonstrated enantioselective decarboxylative Mannich and aldol couplings, which enable the direct formation of chiral β-amino ketones and α-hydroxy esters, respectively. More recently, domino sequences such as tandem decarboxylative Michael/aldol cascades have delivered complex cyclised scaffolds in a single operation. The field has witnessed a broadening of substrate classes, ranging from β-keto acids and malonic esters to 1,3-dicarbonyls, while optimising catalytic turnover and stereoselectivity. The operational simplicity, often allied to green solvents and benign by-products, underscores the global relevance of these processes for the sustainable synthesis of enantiopure building blocks in the pharmaceutical and agrochemical industries.

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Enantioselective Decarboxylative Reactions in Organic Synthesis publication trend

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Technical terms

Enantioselective decarboxylative reaction: A transformation in which a carboxylate moiety is expelled as carbon dioxide and the resulting carbon–carbon bond-forming event occurs with preferential formation of one enantiomer.

Enolate: A resonance-stabilised anion generated by deprotonation at the α-carbon of a carbonyl compound, serving as a nucleophilic intermediate in many carbon–carbon bond-forming reactions.

Organocatalysis: Catalytic activation of substrates by small organic molecules, often bearing multiple functional groups, to achieve bond formation with control over stereochemistry.

β-Keto acid: A carboxylic acid containing a ketone functionality at the β-position, which readily undergoes decarboxylation to generate enolate species.

Mannich reaction: A three-component condensation between an imine and an enol(ate) equivalent to furnish β-amino carbonyl adducts.

Aldol reaction: A carbon–carbon bond formation between an enol(ate) donor and an aldehyde or ketone electrophile to yield β-hydroxy carbonyl products.

References

1. A Dual Role for the N‑Perfluorobutanesulfinamide Auxiliary in an Asymmetric Decarboxylative Mannich Reaction. Organic Letters (2024).
2. Asymmetric organocatalytic decarboxylative Mannich reaction using β-keto acids: A new protocol for the synthesis of chiral β-amino ketones. Beilstein Journal of Organic Chemistry (2012).
3. A convenient enantioselective decarboxylative aldol reaction to access chiral α-hydroxy esters using β-keto acids. Beilstein Journal of Organic Chemistry (2014).